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New Products
Further information concerning the material described below can be obtained by writing direct to the manufacturers. As in the case of technical papers, publication of these news items does not constitute endorsement of the manufacturer's statements nor of his products.
New Filament Lamp
A 3000-watt incandescent lamp to compete with arc lamps for spotlighting stage shows has been developed by General Electric's Lamp Department at Nela Park, Ohio.
Producing an estimated 900,000 candle power in properly designed equipment, the new spotlight is intended primarily for lighting the stage from distances of 75 to 150 feet. It is seen by General Electric's illuminating engineers as suitable for outdoor theaters, sports arenas, auditoriums, itinerant spectacles, and other applications where the long-distance projection of an intense beam of light is required.
Because of its simplicity of operation in a well-constructed fixture, and because of its advantages over arc spotlights, the lamp is seen by lighting designers as permitting the application of professional stage-lighting techniques to retail store fashion shows and other demonstrations. It is expected to be used widely in television lighting.
The new lamp is tubular in shape, four inches in diameter and nearly a foot long. Of bipost construction, it is intended to be burned vertically in a base-up position. This causes blackening to occur outside of the pickup range of the reflector, thus contributing greatly to the prolonged efficiency of the lamp. It has a rated burning life of 100 hours.
The lamp's light output is not subject to variations common to arc lamps. Unlike arc lamps, the lamp
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can be dimmed as desired. The current required is half that of a 70ampere, direct-current arc, thereby permitting more light for the same wiring capacity. At a throw of 100
feet, it gives an average of 90 footcandles of light for a spot six feet in diameter, an amount equal to the illumination from a 70-ampere arc. At wider spreads, it can produce greater illumination than even higher current arcs.